Problem Configuring Headphones U-Mix Control 2

Hello,
I was recently given a U-Mix Control 2 as a bday gift. I installed all the software and seems to be working perfectly with my MacBook (basic, not Mac Book PRO) except for one issue. I can't seem to be able to configure the headphones to be able to monitor without both song audio going out through the main speakers. I noticed that a friends U-Mix Control Pro has the headphone jack for this specific purpose but mine doesn't. I connected the headphones and the speakers with a splitter. Is there anything I need to do in terms of software configuration?
Any help is appreciated.
Thanks!!
I was recently given a U-Mix Control 2 as a bday gift. I installed all the software and seems to be working perfectly with my MacBook (basic, not Mac Book PRO) except for one issue. I can't seem to be able to configure the headphones to be able to monitor without both song audio going out through the main speakers. I noticed that a friends U-Mix Control Pro has the headphone jack for this specific purpose but mine doesn't. I connected the headphones and the speakers with a splitter. Is there anything I need to do in terms of software configuration?
Any help is appreciated.
Thanks!!